When I first started working on Li-ion batteries, I was naïve to think that 2-electrode half cells would be sufficient in studying the electrochemistry of porous composite electrodes. Later I learned that even a big oversized chunk of Li metal could contribute significantly to the overpotentials and impedances. After realizing the importance of using 3-electrode cells for electroanalytical research, we spent a lot of time trying to find a stable design that could work with the coin cell platform.
Here I’d like to share the method we are using today to make 3-electrode coin cells. For stable impedance measurements, we found that it was important to have a sizable reference electrode inside the cell stack. Having an in-stack reference electrode while still having access to the standard coin cell platform allows for quite a high experiment throughput. Hope this tutorial video helps you try it out. Perhaps in the near future we will be able to share more details on how we tested this cell design.
Last modified: Feb. 22, 2022